There is probably no engineering project that requires a more compatible marriage between hydrogeology and engineering than the construction of a tunnel. 

In case after case, the primary geotechnical problem encountered during tunnel construction involved the inflow of groundwater.

The prediction of groundwater inflow into a tunnel is important for designing the tunnel drainage system and to minimize environmental impacts and the risk of tunnel instabilities and subsidence damage. Analytical solutions exist to calculate tunnel inflow, and, increasingly, numerical groundwater models are used to this end.

Tasks:

Use MAGNET to simulate the groundwater flow into the following tunnel configurations, assuming  the water table is plat and 1) steady and unsteady (declines due to leakage into the tunnel)

Note: The steady state approach is valid as long as the water table is not drawn down by the existence of the tunnel. However, for rock formation with low porosity and low specific storage, it is unlikely that steady state conditions could be maintained.